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Questions with little basis in the manga can also be asked in the Handout Thread to avoid threads with 10 replies max.
Not sure if she wants to lose her "humanity" and that would only enhance her control over snow, while she is a witch of every kind of weather.
I don't think she will, nor should she. The snow snow fruit, or any kind of devil fruit, would be a horrible choice for Nami. She's better off being a human who can swim rather than be specialized in snow and sink.